Granted Patent
Utility
US 5,019,134 · App. 07/391,291
Reactive dyes
Inventors:
Denis Robert Annesley Ridyard, Peter J. Smith
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Aug 8, 1989
Inventors
Denis Robert Annesley Ridyard
Peter J. Smith
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.